How do I deal with network issues?

This page helps you resolve SSL and network errors that prevent W&B from syncing your training data, so you can keep experiments running even on unreliable or restricted networks.

If you encounter SSL or network errors, such as wandb: Network error (ConnectionError), entering retry loop, use any of the following solutions:

• Upgrade the SSL certificate. On an Ubuntu server, run update-ca-certificates. A valid SSL certificate is required to sync training logs securely.
• If the network connection is unstable, operate in offline mode by setting the optional environment variable WANDB_MODE to offline, and sync files later from a device with internet access.
• Consider using W&B Private Hosting, which runs locally and avoids syncing to cloud servers.

If you specifically see the SSL CERTIFICATE_VERIFY_FAILED error, the issue might stem from a company firewall intercepting traffic. Point the requests library at your local CA bundle so W&B trusts the firewall’s certificate:

export REQUESTS_CA_BUNDLE=/etc/ssl/certs/ca-certificates.crt

---

Connectivity